minix/kernel/profile.c
2009-01-09 21:44:52 +00:00

173 lines
4.7 KiB
C

/*
* This file contains several functions and variables used for system
* profiling.
*
* Statistical Profiling:
* The interrupt handler for profiling clock.
*
* Call Profiling:
* The table used for profiling data and a function to get its size.
*
* The function used by kernelspace processes to register the locations
* of their control struct and profiling table.
*
* Changes:
* 14 Aug, 2006 Created, (Rogier Meurs)
*/
#include <minix/config.h>
#include <minix/profile.h>
#include <minix/portio.h>
#include "kernel.h"
#include "profile.h"
#include "proc.h"
#if SPROFILE
#include <string.h>
/* Function prototype for the profiling clock handler. */
FORWARD _PROTOTYPE( int profile_clock_handler, (irq_hook_t *hook) );
/* A hook for the profiling clock interrupt handler. */
PRIVATE irq_hook_t profile_clock_hook;
/*===========================================================================*
* init_profile_clock *
*===========================================================================*/
PUBLIC void init_profile_clock(u32_t freq)
{
int r, irq;
intr_disable();
if((irq = arch_init_profile_clock(freq)) >= 0) {
/* Register interrupt handler for statistical system profiling. */
profile_clock_hook.proc_nr_e = CLOCK;
put_irq_handler(&profile_clock_hook, irq, profile_clock_handler);
enable_irq(&profile_clock_hook);
}
intr_enable();
}
/*===========================================================================*
* profile_clock_stop *
*===========================================================================*/
PUBLIC void stop_profile_clock()
{
intr_disable();
arch_stop_profile_clock();
intr_enable();
/* Unregister interrupt handler. */
disable_irq(&profile_clock_hook);
rm_irq_handler(&profile_clock_hook);
}
/*===========================================================================*
* profile_clock_handler *
*===========================================================================*/
PRIVATE int profile_clock_handler(hook)
irq_hook_t *hook;
{
/* This executes on every tick of the CMOS timer. */
/* Are we profiling, and profiling memory not full? */
if (!sprofiling || sprof_info.mem_used == -1) return (1);
/* Check if enough memory available before writing sample. */
if (sprof_info.mem_used + sizeof(sprof_info) > sprof_mem_size) {
sprof_info.mem_used = -1;
return(1);
}
/* All is OK */
/* Idle process? */
if (priv(proc_ptr)->s_proc_nr == IDLE) {
sprof_info.idle_samples++;
} else
/* Runnable system process? */
if (priv(proc_ptr)->s_flags & SYS_PROC && !proc_ptr->p_rts_flags) {
/* Note: k_reenter is always 0 here. */
/* Store sample (process name and program counter). */
data_copy(SYSTEM, (vir_bytes) proc_ptr->p_name,
sprof_ep, sprof_data_addr_vir + sprof_info.mem_used,
strlen(proc_ptr->p_name));
data_copy(SYSTEM, (vir_bytes) &proc_ptr->p_reg.pc, sprof_ep,
(vir_bytes) (sprof_data_addr_vir + sprof_info.mem_used +
sizeof(proc_ptr->p_name)),
(vir_bytes) sizeof(proc_ptr->p_reg.pc));
sprof_info.mem_used += sizeof(sprof_sample);
sprof_info.system_samples++;
} else {
/* User process. */
sprof_info.user_samples++;
}
sprof_info.total_samples++;
/* Acknowledge interrupt if necessary. */
arch_ack_profile_clock();
return(1); /* reenable interrupts */
}
#endif /* SPROFILE */
/*
* The following variables and functions are used by the procentry/
* procentry syslib functions when linked with kernelspace processes.
* For userspace processes, the same variables and function are defined
* elsewhere. This enables different functionality and variable sizes,
* which is needed is a few cases.
*/
/* A small table is declared for the kernelspace processes. */
struct cprof_tbl_s cprof_tbl[CPROF_TABLE_SIZE_KERNEL];
/* Function that returns table size. */
PUBLIC int profile_get_tbl_size(void)
{
return CPROF_TABLE_SIZE_KERNEL;
}
/* Function that returns on which execution of procentry to announce. */
PUBLIC int profile_get_announce(void)
{
return CPROF_ACCOUNCE_KERNEL;
}
/*
* The kernel "announces" its control struct and table locations
* to itself through this function.
*/
PUBLIC void profile_register(ctl_ptr, tbl_ptr)
void *ctl_ptr;
void *tbl_ptr;
{
int proc_nr;
vir_bytes vir_dst;
struct proc *rp;
if(cprof_procs_no >= NR_SYS_PROCS)
return;
/* Store process name, control struct, table locations. */
rp = proc_addr(SYSTEM);
cprof_proc_info[cprof_procs_no].endpt = rp->p_endpoint;
cprof_proc_info[cprof_procs_no].name = rp->p_name;
cprof_proc_info[cprof_procs_no].ctl_v = (vir_bytes) ctl_ptr;
cprof_proc_info[cprof_procs_no].buf_v = (vir_bytes) tbl_ptr;
cprof_procs_no++;
}